{"id":102262,"date":"2021-11-10T21:36:39","date_gmt":"2021-11-10T19:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-samba-ustraneno-8-opasnyh-uyazvimostej"},"modified":"2021-11-10T21:36:39","modified_gmt":"2021-11-10T19:36:39","slug":"v-samba-ustraneno-8-opasnyh-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/v-samba-ustraneno-8-opasnyh-uyazvimostej","title":{"rendered":"\u00c5tta kritiska s\u00e5rbarheter har \u00e5tg\u00e4rdats i Samba","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Korrekta versioner av Samba-paket 4.15.2, 4.14.10 och 4.13.14 har publicerats med \u00e5tg\u00e4rder f\u00f6r 8 s\u00e5rbarheter, varav de flesta kan leda till en fullst\u00e4ndig kompromiss av Active Directory-dom\u00e4nen. Det \u00e4r anm\u00e4rkningsv\u00e4rt att ett av problemen har \u00e5tg\u00e4rdats sedan 2016, och fem har funnits sedan 2020, \u00e4nd\u00e5 ledde en fix till att winbindd inte kunde startas med inst\u00e4llningen \"allow trusted domains = no\" (utvecklarna planerar att snabbt sl\u00e4ppa en ytterligare uppdatering med en l\u00f6sning). Uppdateringar av paketen i distributionerna kan sp\u00e5ras p\u00e5 sidorna: Debian, Ubuntu, RHEL, SUSE, Fedora, Arch, FreeBSD.    <\/p>\n<p>\u00c5tg\u00e4rdade s\u00e5rbarheter:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-25717 \u2014 p\u00e5 grund av ett bristande logik i mappningen av dom\u00e4nanv\u00e4ndare till lokala systemanv\u00e4ndare, kunde en dom\u00e4nanv\u00e4ndare fr\u00e5n Active Directory med r\u00e4tt att skapa nya konton p\u00e5 sitt system, som hanteras genom ms-DS-MachineAccountQuota, f\u00e5 root-\u00e5tkomst till andra system som ing\u00e5r i <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/domain\/\"   title=\"dom\u00e4nen\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4094\">dom\u00e4nen<\/a>.\n<li class=\"l\"> CVE-2021-3738 \u2014 \u00e5tkomst till redan frigjord minnesomr\u00e5den (Use after free) i implementationen av Samba AD DC RPC-server (dsdb), vilket potentiellt kan leda till h\u00f6jda privilegier vid manipulation av anslutningsinst\u00e4llningar.\n<li class=\"l\"> CVE-2016-2124 \u2014 klientanslutningar som etableras med hj\u00e4lp av SMB1-protokollet kan leda till \u00f6verf\u00f6ring av autentiseringsparametrar i klartext eller via NTLM (till exempel f\u00f6r att avsl\u00f6ja legitimation vid MITM-attacker), \u00e4ven om den obligatoriska autentiseringen via Kerberos har definierats f\u00f6r anv\u00e4ndaren eller applikationen i inst\u00e4llningarna.\n<li class=\"l\"> CVE-2020-25722 \u2014 i Active Directory-dom\u00e4nkontrollern baserad p\u00e5 Samba utf\u00f6rdes inte adekvata \u00e5tkomstkontroller p\u00e5 de lagrade uppgifterna, vilket gjorde att vilken anv\u00e4ndare som helst kunde kringg\u00e5 beh\u00f6righetskontrollerna och helt kompromettera dom\u00e4nen.\n<li class=\"l\"> CVE-2020-25718 \u2014 i Active Directory-dom\u00e4nkontrollern baserad p\u00e5 Samba isolerades inte Kerberos-biljetter som utf\u00e4rdats av RODC (Read-only domain controller) korrekt, vilket skulle kunna anv\u00e4ndas f\u00f6r att f\u00e5 administrat\u00f6rsbiljetter fr\u00e5n RODC utan att ha r\u00e4ttigheter f\u00f6r detta.\n<li class=\"l\"> CVE-2020-25719 \u2013 dom\u00e4nkontrollant f\u00f6r Active Directory baserat p\u00e5 Samba beaktade inte alltid f\u00e4lten SID och PAC i Kerberos-biljetter (n\u00e4r inst\u00e4llningen \"gensec:require_pac = true\" var aktiverad kontrollerades endast namnet, medan PAC inte beaktades), vilket gjorde det m\u00f6jligt f\u00f6r en anv\u00e4ndare med r\u00e4tt att skapa konton p\u00e5 det lokala systemet att utge sig f\u00f6r att vara en annan anv\u00e4ndare i dom\u00e4nen, inklusive en med privilegier.\n<li class=\"l\"> CVE-2020-25721 \u2013 f\u00f6r anv\u00e4ndare som autentiserades med Kerberos tilldelades inte alltid unika identifierare f\u00f6r Active Directory (objectSid), vilket kunde leda till kollisioner mellan anv\u00e4ndare.\n<li class=\"l\"> CVE-2021-23192 \u2013 vid genomf\u00f6rande av en MITM-attack fanns det m\u00f6jlighet att ers\u00e4tta fragment i stora DCE\/RPC-f\u00f6rfr\u00e5gningar som delades upp i flera delar.  <\/ul>\n<p>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56132\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 Samba 4.15.2, 4.14.10 \u0438 4.13.14 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 8 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u043b\u043d\u043e\u0439 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u0438 \u0434\u043e\u043c\u0435\u043d\u0430 Active Directory. \u041f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0447\u0442\u043e \u043e\u0434\u043d\u0443 \u0438\u0437 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0438 \u0441 2016 \u0433\u043e\u0434\u0430, \u0430 \u043f\u044f\u0442\u044c &#8212; \u0441 2020 \u0433\u043e\u0434\u0430, \u0442\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 \u043e\u0434\u043d\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0435\u043b\u043e \u043a \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c winbindd \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 &#171;allow trusted domains [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102262","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 Samba 4.15.2, 4.14.10 \u0438 4.13.14 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 8 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, 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